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chromium/content/test/data/accessibility/mac/attributes/ax-math-root-index.html 

<!DOCTYPE html>
<!--
@SCRIPT:
  root1.AXMathRootIndex.AXChildren.count
  root1.AXMathRootIndex.AXChildren[0].AXValue
  root2.AXMathRootIndex
-->
<math>
  <mroot id="root1">
    <mn>1</mn>
    <mn>2</mn>
  </mroot>
  <mroot id="root2">
    <mn>1</mn>
  </mroot>
</math>